As a rabid fan of NIN, I can honestly tell you you'll have to be discriptive on what you're looking for. Alot of Trent's work cover a large basis of sound as well as mood. I could sit here and yap all night long but I'll just say, give it all a once over, there's alot of great songs (and some BAD ones) to be had. I'd suggest going through what you can find.